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// Dashboard widget to show number of Manager messages
$id = $modx->user->get('id');
$output = 'No messages.';
$total = $modx->getCount('modUserMessage',array(
   'recipient' => $id,
));
if($total) {
  $output = 'You have ' . $total . ' messages'; 
  $unread = $modx->getCount('modUserMessage',array(
     'recipient' => $id,
     'read' => 0,
  ));
  if($unread) { 
    $output .= ', <span style="color: red;">' . $unread . ' unread</span>';
  }
  $output .= '.<br><a href="[[++base_url]]manager/?a=security/message">Messages</a>';
}

return $output;